References used in posts and feel free to go to them for more information.
References
American Heart Association. (2011). Physical activity. Retrieved from http://www.americanheart.org/presenter.jhtml?identifier=4563
Department of Health and Human Services. (2008). Physical activity facts. Retrieved from http://www.fitness.gov/resources/facts/index.html
Doyle, A. (2000). Physical activity. Retrieved from http://www2.gsu.edu/~wwwfit/physicalactivity.html
Livestrong. (2011). How the body changes during exercise. Retrieved from http://www.livestrong.com/article/406854-how-the-body-changes-during-exercise/
United States Department of Agriculture. (2011). Why is physical activity important? Retrieved from http://www.mypyramid.gov/pyramid/physical_activity_why.html
